CN110337026A - A kind of video code rate self-adapting regulation method of cloud intercom system - Google Patents
A kind of video code rate self-adapting regulation method of cloud intercom system Download PDFInfo
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- CN110337026A CN110337026A CN201910527145.XA CN201910527145A CN110337026A CN 110337026 A CN110337026 A CN 110337026A CN 201910527145 A CN201910527145 A CN 201910527145A CN 110337026 A CN110337026 A CN 110337026A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/437—Interfacing the upstream path of the transmission network, e.g. for transmitting client requests to a VOD server
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440218—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44245—Monitoring the upstream path of the transmission network, e.g. its availability, bandwidth
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4621—Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Telephonic Communication Services (AREA)
Abstract
The present invention discloses a kind of video code rate self-adapting regulation method of cloud intercom system, data transmission is realized based on wide area network, cloud intercom system includes the equipment for acquiring video, H.264 encoder, multichannel transponder, if video code rate self-adaptive control module and hand dryer, equipment end is equipped with the retransmission buffer that packet loss is retransmitted, APP corresponding with equipment is installed on mobile phone, comprising steps of equipment acquires video image, after carrying out compressed encoding with H.264 encoder, cell phone application is sent to by cloud intercommunication agreement with multichannel transponder, the data buffer storage of failure is sent to retransmission buffer；Video code rate self-adaptive control module timing reading retransmission buffer is full of angle value, is maximized judgement Network status, and reset real-time video code rate according to result.The present invention realizes that video code rate adjusts in real time according to network congestion, is close to but is no more than wide area network real-time bandwidth, not only can farthest utilize network bandwidth, but also can avoid the APP video delay Caton for causing mobile phone because of network congestion.
Description
Technical field
The present invention relates to field of data transmission, a kind of video code rate of the cloud intercom system adaptively side of adjustment is particularly related to
Method.
Background technique
In the cloud intercom system of intelligence community, it is visual right that intelligent entrance guard equipment can be carried out by wide area network with cell phone application
It says.But wide area network real network bandwidth can dynamic change at any time.Had using the progress video compress transmission of single code rate as follows
Disadvantage: when video code rate is less than real network bandwidth, cell phone application receives the video image quality played can be poor；And work as video codes
When rate is greater than real network bandwidth, cell phone application receives the video played will appear Caton phenomenon again.
In existing technical solution, Transmission Control Protocol subtracts the algorithm of (AIMD) using multiplying property of additivity increasing to realize network congestion control
System.The thought that additivity increases is, when detecting network without congestion (receiving the ACK packet of unacknowledged data), often to receive one
Congestion window value (CongWin) is just increased a MSS* (MSS/CongWin) by ACK packet, and (wherein MSS indicates maximum message segment segment length
Degree)；The thought that multiplying property subtracts is that, when the event of packet loss occurs, congestion window is kept to the half of last time every time.Congestion control association
The class linear increase stage of view, which is referred to as, avoids congestion phases.In network transmission process, congestion window value can duplicate experience
One lifting circulation, i.e., duplicate class linear increase drops suddenly to half again, so the variation of congestion window is jagged.Make
It is with the benefit that additivity increases the congestion avoidance algorithm that multiplying property subtracts: in the case that network is good, the linear increase transmission of simple class
Code rate just stops increasing when network packet loss occurs, and the increase of such code rate is relatively slow, it can be achieved that band can be used with caution by detecting
It is wide；When the case where encountering congestion, the reduction code rate of multiplying property, the reduction of such code rate is very fast, can avoid the continuous loss of network holding.With
This congestion avoidance algorithm is plus packet loss retransmission mechanism, it can be achieved that higher network bandwidth utilization factor.Moreover, an if equipment
There are multiple TCP flows for increasing multiplying property down control using additivity, these streams, which are eventually converged to, competes use state to the equivalent of route.
Above-mentioned technical proposal cannot be used directly for the control of wide area network transmission of video code rate.When video data is in practical wide area network
In transmission, Network status complicated and changeable can be encountered, above-mentioned technical proposal is to the adjustment shortcoming specific aim of video code rate and flexibly
Property.
Summary of the invention
The purpose of the present invention is to provide a kind of video code rate self-adapting regulation methods of cloud intercom system, can be according to network
Congestion condition adjusts video code rate in real time, utilizes network bandwidth to greatest extent, avoids cell phone application video cardton.
In order to achieve the above objectives, solution of the invention is:
A kind of video code rate self-adapting regulation method of cloud intercom system realizes data transmission, the cloud intercommunication based on wide area network
If system include for acquire the equipment of video, H.264 encoder, multichannel transponder, video code rate self-adaptive control module and
Dry platform mobile phone, equipment end are provided with the retransmission buffer retransmitted for realizing packet loss, are equipped on mobile phone corresponding with equipment
APP, comprising the following steps:
Step 1, equipment acquire video image in real time, carry out compressed encoding to video image with H.264 encoder, then will compression
Data are sent in the APP of each mobile phone with multichannel transponder by cloud intercommunication agreement, and it is slow not send successful compressed data
It is stored in retransmission buffer；
Step 2, video code rate self-adaptive control module are read once every T time per the degree of filling of retransmission buffer all the way
Value, carries out the network congestion situation judged Mei all the way: as F < FminWhen, network idle；Work as Fmin≤F≤FfullWhen, network is full
It carries；As F > FfullWhen, the slight congestion of network；As F >=FblinkWhen, network moderate congestion；As F < FblinkWhen, network is gathered around from moderate
Restore in plug；As F >=FstopWhen, network heavy congestion；As F < FstopWhen, network restores from heavy congestion；As F >=FstopAnd
The continuous N of F1Secondary incremental or continuous N2Secondary F >=FfullstopWhen, network extreme congestion；Wherein, T, Fmin、Ffull、Fblink、Fstop、
Ffullstop、N1And N2It is constant, and Fmin< Ffull< Fblink< Fstop< Ffullstop；
Step 3, video code rate self-adaptive control module are judged according to being read in step 2 full of the maximum value in angle value
Whole network congestion situation, calculates and resets the real-time video code rate R of H.264 encoder, the real-time video code rate R tune
Whole range is [Rmin, Rmax]: when network idle, R=min { (R+AIRmax), Rmax}；As network full load, R={ (R+
AIRmin), Rmax}；When the slight congestion of network, R=max { (α × R), Rmin}；Wherein Rmin、Rmax、AIRmax、AIRminIt is with α
Constant；
Step 4, for per network congestion situation all the way, when network moderate congestion, switch a multichannel forwarding every T time
The video of device stops transmission/starting and sends state, i.e., intermittent to send video；When network restores from moderate congestion, stop
Intermittence sends video, which persistently sends video according to real-time video code rate R；When network heavy congestion, stop the road
Video is sent；When network restores from heavy congestion, the video for restarting the road is sent；It is complete when network extreme congestion
The video on the contract fully road is sent, until current intercommunication or monitoring terminate.
In the step 1, equipment is the camera of intelligent entrance guard equipment.
In the step 2, T=750ms, Fmin=0.01, Ffull=0.02, Fblink=0.0425, Fstop=0.065, Ffullstop=
0.085, N1=5, N2=5。
In the step 3, Rmin=240kbps, Rmax=800kbps, AIRmax=24kbps, AIRmin=10kbps, α=0.80.
In the step 3, when certain road video, which is opened, to be sent, H.264 next frame pressure is weaved into every IDR frame by encoder.
After adopting the above method, the present invention can be achieved to be adjusted video code rate according to network congestion realization, make
Video code rate is close but is no more than wide area network real-time bandwidth, not only can farthest utilize network bandwidth in this way, but it is avoidable because
Network congestion causes the APP video delay Caton of mobile phone.
Detailed description of the invention
Fig. 1 is the flow diagram of the specific embodiment of the invention.
Specific embodiment
In order to further explain the technical solution of the present invention, being explained in detail below by specific embodiment the present invention
It states.
Refering to what is shown in Fig. 1, the present invention is a kind of video code rate self-adapting regulation method of cloud intercom system, it is based on wide area network
Realize data transmission, above-mentioned cloud intercom system includes for acquiring the equipment of video, H.264 encoder, multichannel transponder, video
Code rate self-adaptive control module and several mobile phones, equipment end are provided with the retransmission buffer retransmitted for realizing packet loss, mobile phone
On APP corresponding with equipment is installed, comprising the following steps:
Step 1, equipment acquire video image in real time, carry out compressed encoding to video image with H.264 encoder, then will compression
Data are sent in the APP of each mobile phone with multichannel transponder (forwarding number >=1) by cloud intercommunication agreement, and success is not sent
Compressed data be cached in retransmission buffer.
Step 2, video code rate self-adaptive control module read once being full of per retransmission buffer all the way every T time
Angle value carries out the network congestion situation judged Mei all the way: as F < FminWhen, network idle；Work as Fmin≤F≤FfullWhen, network is full
It carries；As F > FfullWhen, the slight congestion of network；As F >=FblinkWhen, network moderate congestion；As F < FblinkWhen, network is gathered around from moderate
Restore in plug；As F >=FstopWhen, network heavy congestion；As F < FstopWhen, network restores from heavy congestion；As F >=FstopAnd
The continuous N of F1Secondary incremental or continuous N2Secondary F >=FfullstopWhen, network extreme congestion；Wherein, T, Fmin、Ffull、Fblink、Fstop、
Ffullstop、N1And N2It is constant, is arranged according to the demand of user, and Fmin< Ffull< Fblink< Fstop< Ffullstop。
Step 3, video code rate self-adaptive control module are carried out according to being read in step 2 full of the maximum value in angle value
Judge whole network congestion situation, calculates and reset the real-time video code rate R of H.264 encoder, the real-time video code
The range of rate R adjustment is [Rmin, Rmax]: when network idle, R=min { (R+AIRmax), Rmax, rate presses constant AIRmaxIncrease
Add；As network full load, R={ (R+AIRmin), Rmax, rate presses AIRminExploratory increase；When the slight congestion of network, R=
Max { (α × R), Rmin, video code rate is quickly reduced using sex factor α is multiplied；Wherein Rmin、Rmax、AIRmax、AIRminIt is with α
Constant is arranged according to the demand of user；
Step 4, for per network congestion situation all the way, when network moderate congestion, it is corresponding to switch the primary road every T time
The video of multichannel transponder stop transmission/starting and send state (video code rate self-adaptive control module controls multichannel transponder
Output pin forbid/enable the transmission of certain road video), i.e., intermittent to send video, such actual video code rate only has setting value
Half, network congestion situation can be alleviated；When network restores from moderate congestion, stop intermittent transmission video, the road
Video is persistently sent according to real-time video code rate R；When network heavy congestion, the video for stopping the road being sent；When network as strict as possible
When restoring in weight congestion, the video for restarting the road is sent；When network extreme congestion, the video hair on the road is completely closed
It send, preferentially to guarantee the transmission of signaling and audio data, until current intercommunication or monitoring terminate.
Equipment in above-mentioned steps 1 is the camera of intelligent entrance guard equipment.
In above-mentioned steps 2, T=750ms, Fmin=0.01, Ffull=0.02, Fblink=0.0425, Fstop=0.065, Ffullstop=
0.085, N1=5, N2=5。
In above-mentioned steps 3, Rmin=240kbps, Rmax=800kbps, AIRmax=24kbps, AIRmin=10kbps, α=0.80.
In above-mentioned steps 3, when certain road video, which is opened, to be sent, H.264 next frame pressure is weaved into every IDR frame by encoder, from
APP real-time video without influencing mobile phone receives decoding display.
Above-mentioned wide area network can be wired connection, be also possible to the wireless connection such as WiFi, 4G.
By the above method, the present invention can be achieved to be adjusted video code rate according to network congestion realization, make to regard
Frequency code rate is close but is no more than wide area network real-time bandwidth, not only can farthest utilize network bandwidth in this way, but also can avoid because of net
Network congestion causes the APP video delay Caton of mobile phone.
Above-described embodiment and schema and non-limiting product form and style of the invention, any technical field it is common
The appropriate changes or modifications that technical staff does it all should be regarded as not departing from patent category of the invention.
Claims (5)
1. a kind of video code rate self-adapting regulation method of cloud intercom system, it is characterised in that: realize that data pass based on wide area network
Defeated, the cloud intercom system includes that the equipment of video, H.264 encoder, multichannel transponder, video code rate are adaptive for acquiring
Control module and several mobile phones, equipment end are provided with the retransmission buffer retransmitted for realizing packet loss, be equipped on mobile phone with
The corresponding APP of equipment, comprising the following steps:
Step 1, equipment acquire video image in real time, carry out compressed encoding to video image with H.264 encoder, then will compression
Data are sent in the APP of each mobile phone with multichannel transponder by cloud intercommunication agreement, and it is slow not send successful compressed data
It is stored in retransmission buffer；
Step 2, video code rate self-adaptive control module are read once every T time per the degree of filling of retransmission buffer all the way
Value, carries out the network congestion situation judged Mei all the way: as F < FminWhen, network idle；Work as Fmin≤F≤FfullWhen, network is full
It carries；As F > FfullWhen, the slight congestion of network；As F >=FblinkWhen, network moderate congestion；As F < FblinkWhen, network is gathered around from moderate
Restore in plug；As F >=FstopWhen, network heavy congestion；As F < FstopWhen, network restores from heavy congestion；As F >=FstopAnd
The continuous N of F1Secondary incremental or continuous N2Secondary F >=FfullstopWhen, network extreme congestion；Wherein, T, Fmin、Ffull、Fblink、Fstop、
Ffullstop、N1And N2It is constant, and Fmin< Ffull< Fblink< Fstop< Ffullstop；
Step 3, video code rate self-adaptive control module are judged according to being read in step 2 full of the maximum value in angle value
Whole network congestion situation, calculates and resets the real-time video code rate R of H.264 encoder, the real-time video code rate R tune
Whole range is [Rmin, Rmax]: when network idle, R=min { (R+AIRmax), Rmax}；As network full load, R={ (R+
AIRmin), Rmax}；When the slight congestion of network, R=max { (α × R), Rmin}；Wherein Rmin、Rmax、AIRmax、AIRminIt is with α
Constant；
Step 4, for per network congestion situation all the way, when network moderate congestion, switch a multichannel forwarding every T time
The video of device stops transmission/starting and sends state, i.e., intermittent to send video；When network restores from moderate congestion, stop
Intermittence sends video, which persistently sends video according to real-time video code rate R；When network heavy congestion, stop the road
Video is sent；When network restores from heavy congestion, the video for restarting the road is sent；It is complete when network extreme congestion
The video on the contract fully road is sent, until current intercommunication or monitoring terminate.
2. a kind of video code rate self-adapting regulation method of cloud intercom system as described in claim 1, it is characterised in that: described
In step 1, equipment is the camera of intelligent entrance guard equipment.
3. a kind of video code rate self-adapting regulation method of cloud intercom system as described in claim 1, it is characterised in that: described
In step 2, T=750ms, Fmin=0.01, Ffull=0.02, Fblink=0.0425, Fstop=0.065, Ffullstop=0.085, N1=5, N2
=5。
4. a kind of video code rate self-adapting regulation method of cloud intercom system as described in claim 1, it is characterised in that: described
In step 3, Rmin=240kbps, Rmax=800kbps, AIRmax=24kbps, AIRmin=10kbps, α=0.80.
5. a kind of video code rate self-adapting regulation method of cloud intercom system as described in claim 1, it is characterised in that: described
In step 3, when certain road video, which is opened, to be sent, H.264 next frame pressure is weaved into every IDR frame by encoder.
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